Dubbo实现服务降级、限流、熔断,让服务的高可用和容错
1. Maven依赖类库坐标:
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-dependencies-zookeeper</artifactId>
<version>2.7.8</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo</artifactId>
<version>2.7.8</version>
</dependency>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>dubbo-config-spring</artifactId>
<version>2.7.8</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo-go-remoting-api</artifactId>
<version>1.4.0</version>
</dependency>
<dependency>
<groupId>org.apache.curator</groupId>
<artifactId>curator-test</artifactId>
<version>4.0.1</version>
<scope>test</scope>
</dependency>
- dubbo-dependencies-zookeeper:Dubbo框架的ZooKeeper依赖库,用于服务注册和发现。
- dubbo:Dubbo核心库,提供Dubbo框架的核心功能。
- dubbo-config-spring:Dubbo的Spring配置支持库,提供与Spring的集成支持。
- dubbo-go-remoting-api:Dubbo的远程通信API库,提供与Dubbo的远程通信相关的功能。
- curator-test:Apache Curator的测试库,用于模拟ZooKeeper服务器。
2. Dubbo服务降级、限流、熔断样例(完整Java代码):
import org.apache.dubbo.config.ApplicationConfig;
import org.apache.dubbo.config.ReferenceConfig;
import org.apache.dubbo.config.RegistryConfig;
import org.apache.dubbo.config.ServiceConfig;
public class DubboServiceExample {
public static void main(String[] args) {
// 当前应用配置
ApplicationConfig application = new ApplicationConfig();
application.setName("dubbo-demo");
// 连接注册中心配置
RegistryConfig registry = new RegistryConfig();
registry.setAddress("zookeeper://127.0.0.1:2181");
// 服务提供者配置
ServiceConfig<DemoService> service = new ServiceConfig<>();
service.setApplication(application);
service.setRegistry(registry);
service.setInterface(DemoService.class);
service.setRef(new DemoServiceImpl());
service.export();
// 服务消费者配置
ReferenceConfig<DemoService> reference = new ReferenceConfig<>();
reference.setApplication(application);
reference.setRegistry(registry);
reference.setInterface(DemoService.class);
DemoService demoService = reference.get();
// 调用服务接口
String result = demoService.sayHello("Dubbo");
System.out.println(result);
}
}
public interface DemoService {
String sayHello(String name);
}
public class DemoServiceImpl implements DemoService {
@Override
public String sayHello(String name) {
return "Hello " + name;
}
}
3. 总结:
Dubbo是一个高性能的分布式服务框架,通过依赖类库的引入和配置,可以实现服务降级、限流和熔断等容错和高可用的功能。在样例代码中,通过配置Dubbo的应用、注册中心、服务提供者和服务消费者等参数,可以提供一个简单的Dubbo服务,并进行调用。通过Dubbo的服务降级、限流和熔断等特性,可以更好地保证系统的可用性和容错性。